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Finding the Fourth Proportional to 3,891.56, 5,368.82 and 2,189.68

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Solution

The fourth proportional to 3,891.56, 5,368.82 and 2,189.68 is: 3,020.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.56 : 5,368.82 = 2,189.68 : x
  2. Step 2: Convert to fraction form
    3,891.56/5,368.82 = 2,189.68/x
  3. Step 3: Cross multiply
    3,891.56x = 5,368.82 × 2,189.68
  4. Step 4: Simplify right side
    3,891.56x = 11,755,997.78
  5. Step 5: Solve for x
    x = 11,755,997.78/3,891.56
  6. Step 6: Final answer
    x = 3,020.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.